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  <h2 class="title">安装</h2>
  <p class="para">
   The libxml extension is enabled by default, although it may be disabled with
   <strong class="option configure">--disable-libxml</strong>
. 
  </p>
  <p class="para">
   The optional <strong class="option configure">--with-libxml-dir</strong>

   directive is used to specify the location of <em>libxml</em>
   on the system that PHP is being compiled on, otherwise only the
   default locations are scanned. The <em>configure</em> process
   checks for libxml (specifically, <em>xml2-config</em>) in the
   following order:
  </p>
  <ol type="1">
   <li class="listitem">
    <p class="para">
     The location ([DIR]) specified with <strong class="option configure">--with-libxml-dir</strong>
 
     ([DIR]=<var class="filename">/bin/xml2-config</var>)
    </p>
   </li>
   <li class="listitem">
    <p class="para">
     <var class="filename">/usr/local/bin/xml2-config</var>
    </p>
   </li>
   <li class="listitem">
    <p class="para">
     <var class="filename">/usr/bin/xml2-config</var>
    </p>
   </li>
  </ol>
  <p class="para">
   If <em>configure</em> cannot find <var class="filename">xml2-config</var> in the directory
   specified by <strong class="option configure">--with-libxml-dir</strong>
, then
   it&#039;ll continue on and check the default locations.
  </p>
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